The protonation constants of some aliphatic alkylamines in ethanol-water mixtures

Protonation constants of methyl-, ethyl-, propyl- and butylamines were determined potentiometrically using an electrode system calibrated in concentration units of hydrogen ion in ethanol-water mixtures (10% -80%ethanol, v/v) at an ionic strength of 0.1 and at 25°C. The trend in the values of proton...

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Bibliographic Details
Published in:Turkish journal of chemistry 2002, Vol.26 (6), p.843-849
Main Authors: GÖKÇE, Gültekin, CANEL, Esin, KILIÇ, Esma
Format: Article
Language:English
Subjects:
Alifatik amin
aliphatic amine
Analitik Kimya, Ayırma Yöntemleri
Analytical Chemistry, Separation Methods
Fizikokimya
Physical Chemistry
Potansiyometri
potentiometry
Protonation constant
Protonlama sabiti
solvent effect
substituent effect
Substituent etki
Çözücü etkisi
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Summary:Protonation constants of methyl-, ethyl-, propyl- and butylamines were determined potentiometrically using an electrode system calibrated in concentration units of hydrogen ion in ethanol-water mixtures (10% -80%ethanol, v/v) at an ionic strength of 0.1 and at 25°C. The trend in the values of protonation constants of these aliphatic amines was explained in terms of the number of alkyl groups and solvent composition. The basicity orders were found to be $NH_3 <R_3N < RNH_2 < R_2NH(R:-CH_3, -C_2H_5, -n-C_3H_7$ and -n-$C_4H_9$) in all the solvent mixtures studied.
ISSN:1300-0527
1303-6130